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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Payments to Acquire Equity Method Investments                   $ 19 $ 0 $ 0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 281       $ 151         281 151  
Income (Loss) from Equity Method Investments 26 $ 35 $ 53 $ 35 45 $ 38 $ 49 $ 31   149 163 $ 137
Beginning Balance [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 151       156         151 156  
Joint Venture Earnings [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 149       163         149 163  
Dividends Paid by Joint Venture [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments (92)       (249)         (92) (249)  
Advances [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments (10)       (13)         (10) (13)  
New Investments [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 80       0         80 0  
Cumulative Translation Adjustment [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments (9)       (1)         (9) (1)  
Other Activity [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 1       0         1 0  
Subtotal Before Reclassification [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 270       56         270 56  
Reclassification of excess distribution [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 16       102         16 102  
Recognition of Excess Distribution [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments (5)       (7)         (5) (7)  
Ending Balance [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 281       $ 151         281 $ 151  
Brown & Root JV [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments 58                 58    
EPIC Piping [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investments $ 24                 $ 24    
Industrial Services Business [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Proceeds from Divestiture of Businesses                 $ 48      
Brown & Root JV [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Equity Method Investment, Ownership Percentage 50.00%                 50.00%    
EPIC Piping LLC [Member] | Canadian Pipe Fabrication Business [Member]                        
Equity In Earnings of Unconsolidated Affiliates [Line Items]                        
Payments to Acquire Equity Method Investments                 $ 19